Nut-tapping machine



(No Model.)

. R. 1). PERRY.

NUT TAPPING MACHINE.

No. 554,951. 5 Patented Feb. 18, 1896.

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NITED STATES ATENT FFICE.

RICHARD D. PERRY, OF ELYRIA, OHIO.

N UT-TAPIPING MACHINE.

SPECIFICATION forming part of Letters Patent No. 554,951, dated February 18, 1896.

- Application filed March 5, 71895. $eria1No. 540,670. (No model.)

T0 at whom it may concern.-

Be it known that I, RICHARD D. PERRY, a citizen of the United States, residing at Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Nut-Tapping Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to machines for tapping nuts, nipples and other articles.

The objects sought are simplicity and durability in construction and certainty and rapidity in operation.

In the drawings, Figure 1 is a side elevation of my improved machine. Fig. 2 is a plan view partially in section, and Fig. 3 is a front view of the machine. Fig. 4 is a front detail view of the two arms E E which serve to hold the shaft temporarily against longitudinal movement, and Fig. 5 is an enlarged side view of that part of the shaft which contains the groove in which said arms engage. e Referring to the parts by letters, A represents the bed of the machine, and o two standards which rise from said bed. The tap shaft B is j ournaled in bearings at the upper ends of said standards, and said shaft is susceptible of longitudinal movement in its said bearings.

O and D represent two pulleys mounted axially with respect to the shaft. These pulleys are intended to be revolved in opposite directions by suitable belts, and to be alternately connecting with the shaft by suitable clutching mechanism. In the best embodiment of the invention, as shown in the drawings, these pulleys are mounted on the fixed sleeves c and d, which are supported respectively by the standards 66 and a. On the proximate ends of these sleeves are the annular flanges c d which limit the movement of the pulleys B and O toward each other and the intermediate friction-disk K. This disk is rigidly fixed to the shaft between the two pulleys. It has two conical surfaces, which are adapted to engage frictionally with corresponding surfaces on the pulleys respectively. The said double cone and the corresponding surfaces form a simple clutching device, by means of which the shaft may be connected with either pulley.

The shaft B is constantly pressed forward by a spring F, which in the form shown is secured at its lower end to the standard a, while its upper end, which is bifurcated,

presses against an annular shoulder 19 on the shaft B. Another spring H exerts its force to press the pulley D against the flange cl.

A device is provided for holding the shaft temporarily against longitudinal movement when the friction-disk K is engaging with the pulley D. In the form shown this device consists of two arms E E which are pivoted to the front side of the standard a. The upper ends of said arms are constantly pressed toward each other by a spring 2, which engages with their lower ends. On the shaft B is an annular shoulder b produced by cutting the annular groove 19 in the shaft, and the upper ends of said arms E E are forced by their spring in front of said shoulder when the shaft has been moved backward, thereby, for the time being, preventing the forward longitudinal movement of the shaft.

G represents a movable frame having two sleeves g g and a yoke g, which connects their front ends. The sleeves slide upon guiderods I I, which are secured to the front side of the standard a. On the front end of one of these rods is an adjustable nut t, which limits the forward movement of said frame. A spring J, which maybe of any suitable form, exerts its force against the frame to move it forward. In the yoke-piece g is a hole through which the tap may pass, and on each side of said hole is secured a finger 9 When a piece of work is being tapped, it is held between the fingers g 9 whereby it is prevented from revolving. These fingers are secured to the yoke, and their adjustment toward and from each other is permitted to adapt them for use with work of any size by the screws 9 which pass through slots 9 in the plate and screw into the yoke-piece. A second yoke-piece g connects the rear ends of the sleeves g g, and on the rear side of this yoke is placed a conical lug 9 adapted to enter between the upper ends of the arms E E and separate them, thereby withdrawing them from the groove If.

The operation of the described machine is as follows: Normally the spring F holds the shaft B in its forward position, when the disk K is in engagement with the pulley C. At this time the tap-shaft is revolved in the direction which unscrews the tap, and the arms E E are riding on the shaft behind the groove 11 A workman then places the nut or nipple or other work between the fingers g and presses backward upon it. acting against the tap L moves the shaft B backward to a position where the two arms E E are forced by their springs into the groove b whereby the shaft is held for a time in this position. The described movement of the shaft causes the disengagement of the disk K from pulley C and its engagement with pulley D, whereupon the shaft reverses its revolution. The spring II permits the pulley D to yield slightly, whereby the shaft B reverses its movement without being wrenched or jarred to any great extent. The workman holds the work for an instant longer, after the motion of the shaft is reversed, until the tap has begun to cut the thread, after which the cutting of the thread, the unscrewing of the tap, and the return of the parts of the machine to their first position proceeds automatically, as follows: As the tap enters the work, said work is drawn backward, moving the frame G with it until, when the work is tapped, the conical lug g enters between the arms E E and separates them, whereupon the spring F moves the shaft forward. This disengages the pulley D and friction-disk K, and causes the said disk to engage with pulley C, whereupon the revolution of the shaft is reversed, and the tap unscrews from the work, which drops out of the way, thereby permitting the spring J to move the frame G forward to its normal position.

The machine above described is semiautomaticinits action-that is to say, although a workman must feed the work piece by piece to the machine and must move the shaft longitudinally to initiate the revolution of the shaft in the thread-cutting direction and hold the work until the cutting of the thread has begun the remaining parts of the operation and the return of the parts to their normal positions are automatic. It is not believed, however, that any substantial change in the machinery shown and described would have to be made if other mechanism were added thereto to automatically do that which the workman now has to do, and therefore it is not believed that the addition of such automatic mechanism to the machine shown and described would avoid the claims herein.

The machine might be made so heavy or the work to be tapped might be so large that the workman would find it difiicult to move the shaft longitudinally for the described p urpose. In such cases a lever M (shown in Fig. 1) might be pivoted to a post on and be used to force the work against the tap, as and for the purposes described.

Having described my invention, I claim- The pressure 1. In a tapping-machine, in combination, a longitudinally-movable tap-shaf t, two pulleys mounted axially with respect to said sh aft and adapted to be revolved in opposite directions, clutching mechanism adapted to be operated by the longitudinal movement of the shaft for connecting said pulleys alternately with said shaft, aholding device for preventing the longitudinal movement of the shaft when said clutching mechanism is connecting one of said pulleys with the shaft, mechanism for releasing said holding device, and mechanism for moving the shaft longitudinally to cause said clutching device to connect the other pulley with the shaft, substantially as and for the purpose specified.

2. In a tapping-machine, in combination, a longitudinally-movable tap-shaft having an annular shoulder, two pulleys mounted axially with respect to said shaft, a clutching device adapted to be operated by the longitudinal movement of said shaft, for connecting said shaft with said pulleys alternately, a movable holding device adapted to engage with said shoulder on the shaft to temporarily prevent the longitudinal movement thereof, mechanism for operating said holding device, and a spring for moving the shaft longitudinally, substantially as and for the purpose specified.

3. In a tapping-machine, in combination, a tap-shaft, two pulleys mounted axially with respect to the shaft and adapted to be revolved in opposite directions, clutching mechanism for connecting said pulleys alternately with the shaft, automatic clutch-operating mechanism, a device for preventing the action of the clutch-operatingmechanism, and a sliding frame adapted to operate said preventing device, substantially as and for the purpose specified.

4. In a tapping-machine, in combination, a longitudinally-movable tap-shaft having an annular shoulder, two pulleys mounted axially with respect to said shaft, a double conefaced disk secured to said shaft between said pulleys and adapted to engage with them alternately, spring-actuated arms adapted to engage said annular shoulder on said shaft to hold the shaft against longitudinal movement when said disk is engaging with one pulley, a sliding work-frame, means secured thereto for separating said arms, and a spring for moving the shaft longitudinally to cause the engagement of said disk with the other pulley, substantially as and for the purpose specified.

5. In a nut-tapping machine, in combination, a longitudinally-movable tap-shaft having an annular shoulder, two pulleys mounted axially with respect to said shaft, a frictiondisk secured to said shaft between said pulleys, a spring pressing the shaft and disk thereon toward one pulley, two spring-actuated arms engaging the annular shoulder in the tap-shaft, a sliding frame adapted to prevent the revolution of the work, and a conical lug on said frame adapted to separate said arms, substantially as and for the purpose specified.

6. In a tapping-machine, in combination, a longitudinally-movable tap-shaft, two fixed sleeves which surround said shaft, two pulleys mounted on said sleeves respectively, a friction-disk secured to said shaft between the pulleys and adapted to be brought into frictional engagement with said pulleys alternately by the longitudinal movement of the shaft, a holding device for preventing the longitudinal movement of the shaft when said disk is in engagement with one pulley, a sliding frame for releasing said holding device, and mechanism for moving the shaft to bring the friction-disk thereon into engagement with the other pulley, substantially as and for the purpose specified.

7. In a tapping-machine, in combination, a longitudinally-movable tap-shaft,two pulleys mounted axially with respect to said shaft, a fixed sleeve upon which one of said pulleys is mounted having a flange on its front end, a spring pressing the pulley toward said flange,

, a friction-disk secured to the shaft between RICHARD D. PERRY. Witnesses:

M. H. LEVAGOOD, WV. W. FAY. 

